Journal ArticleDOI
An extended class of scale-invariant and recursive scale space filters
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TLDR
The authors show that only a discrete subset of filters gives rise to an evolution which can be characterized by means of a partial differential equation.Abstract:
Explores how the functional form of scale space filters is determined by a number of a priori conditions. In particular, if one assumes scale space filters to be linear, isotropic convolution filters, then two conditions (viz. recursivity and scale-invariance) suffice to narrow down the collection of possible filters to a family that essentially depends on one parameter which determines the qualitative shape of the filter. Gaussian filters correspond to one particular value of this shape-parameter. For other values the filters exhibit a more complicated pattern of excitatory and inhibitory regions. This might well be relevant to the study of the neurophysiology of biological visual systems, for recent research shows the existence of extensive disinhibitory regions outside the periphery of the classical center-surround receptive field of LGN and retinal ganglion cells (in cats). Such regions cannot be accounted for by models based on the second order derivative of the Gaussian. Finally, the authors investigate how this work ties in with another axiomatic approach of scale space operators which focuses on the semigroup properties of the operator family. The authors show that only a discrete subset of filters gives rise to an evolution which can be characterized by means of a partial differential equation. >read more
Citations
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Journal ArticleDOI
Feature Detection with Automatic Scale Selection
TL;DR: It is shown how the proposed methodology applies to the problems of blob detection, junction detection, edge detection, ridge detection and local frequency estimation and how it can be used as a major mechanism in algorithms for automatic scale selection, which adapt the local scales of processing to the local image structure.
Book
Anisotropic diffusion in image processing
TL;DR: This work states that all scale-spaces fulllling a few fairly natural axioms are governed by parabolic PDEs with the original image as initial condition, which means that, if one image is brighter than another, then this order is preserved during the entire scale-space evolution.
Journal ArticleDOI
Scale-Space Theory : A Basic Tool for Analysing Structures at Different Scales
TL;DR: In this paper, an inherent property of objects in the world is that they only exist as meaningful entities over certain ranges of scale, and if one aims at describing the structure of unknown real-world signals, then...
Journal ArticleDOI
Review article: Edge and line oriented contour detection: State of the art
Giuseppe Papari,Nicolai Petkov +1 more
TL;DR: The main conclusion is that contour detection has reached high degree of sophistication, taking into account multimodal contour definition (by luminance, color or texture changes), mechanisms for reducing the contour masking influence of noise and texture, perceptual grouping, multiscale aspects and high-level vision information.
BookDOI
Gaussian Scale-Space Theory
TL;DR: This chapter discusses applications of Scale-Space Theory in the context of non-Linear Extensions, as well as specific cases such as multi-Scale Watershed Segmentation, and local Morse Theory for Gaussian Blurred Functions.
References
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Journal ArticleDOI
Handbook of Mathematical Functions
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Table of Integrals, Series, and Products
TL;DR: Combinations involving trigonometric and hyperbolic functions and power 5 Indefinite Integrals of Special Functions 6 Definite Integral Integral Functions 7.Associated Legendre Functions 8 Special Functions 9 Hypergeometric Functions 10 Vector Field Theory 11 Algebraic Inequalities 12 Integral Inequality 13 Matrices and related results 14 Determinants 15 Norms 16 Ordinary differential equations 17 Fourier, Laplace, and Mellin Transforms 18 The z-transform
Book
Real and complex analysis
TL;DR: In this paper, the Riesz representation theorem is used to describe the regularity properties of Borel measures and their relation to the Radon-Nikodym theorem of continuous functions.